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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Computations of Weighted Average Shares Outstanding
The computations of the weighted average shares outstanding for the years ended December 31, are as follows (in millions):
202020192018
Weighted-average shares outstanding424.1 423.2 473.3 
Share-based payment awards classified as participating securities— 0.1 0.4 
Basic weighted-average shares outstanding424.1 423.3 473.7 
Dilutive securities (1)— 0.6 — 
Diluted weighted-average shares outstanding424.1 423.9 473.7 
(1)For 2020 and 2018, 1.1 million and 0.6 million, respectively, potentially dilutive share-based awards are excluded as their effect would be anti-dilutive.